Acidic toilet bowl cleaner. It says, or used to say, that on the label
of some toilet bowl products. The Stuff, or some silly name came like
that, and then I saw a bunch of the stuff at a dollar store, and bought
3 plastic bottles of it. It didnt' do much. Then I noticed the label
was different So it's good enough for normal use, but not for those
deposits.
I once had to use the stuff maybe 6 times in a row to finally get all of
the bowl clean. One could see progress after each time.
When I first moved here, I spent a long time cleaning the dirt out of
the crinkle floor of the shower. It didn't want to go. Now it's
probably just as dirty but it's my dirt and I don't even notice if it's
dirty or not. But toilet bowls are different.

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